Organization
Stella Koo
2031 P, OF
Player profile
  • Summary

  • Hitting

  • Pitching

  • Agility

  • Strength

Summary

Exit Velocity

Best: 65.4 MPH Avg: 58.4 MPH

Bat Speed

Best: 66.8 MPH Avg: 65.5 MPH

Launch Angle

8.3 Deg.

Vertical Jump

16 IN

Broad Jump

66 IN

Overhand Throw

49.0 MPH

Grip Strength

45 / 62.8 (left / right)

Hitting

Exit VelocityAvg.
58.4 MPH
Max
65.4 MPH
Bat SpeedAvg.
65.5 MPH
Max
66.8 MPH
Launch Angle 8.3 Deg.  

Agility

Vertical Jump 16 IN  
Broad Jump 66 IN  

Strength

Overhand Throw 49.0 MPH  
Grip Strength 45 / 62.8 (left / right)

Velocity

PitchMax
Velo.
Screwball 54.4
Dropball 55.7
Riseball 55.7
Other 56.2
Curveball 56.2
Changeup 40.3
Fastball 57.2

Horiz. Break

PitchAvg
Hor. Break
Screwball -4.0
Dropball -3.3
Riseball -2.6
Other -3.2
Curveball -3.7
Changeup -7.1
Fastball -3.3

Vert. Break

PitchAvg
Ver. Break
Screwball 0.1
Dropball -0.6
Riseball -1.3
Other -2.3
Curveball -2.6
Changeup 3.7
Fastball -1.4

True Spin Rate

PitchAvg
True Spin Rate
Screwball 352
Dropball 395
Riseball 552
Other 746
Curveball 481
Changeup 919
Fastball 631

Pitching

PitchVelocity
Max
Horiz. Break
Avg
Vert. Break
Avg
Screwball54.4-4.00.1
Dropball55.7-3.3-0.6
Riseball55.7-2.6-1.3
Other56.2-3.2-2.3
Curveball56.2-3.7-2.6
Changeup40.3-7.13.7
Fastball57.2-3.3-1.4

Velocity

PitchMax
Velo.
Screwball 54.4
Dropball 55.7
Riseball 55.7
Other 56.2
Curveball 56.2
Changeup 40.3
Fastball 57.2

Horiz. Break

PitchAvg
Hor. Break
Screwball -4.0
Dropball -3.3
Riseball -2.6
Other -3.2
Curveball -3.7
Changeup -7.1
Fastball -3.3

Vert. Break

PitchAvg
Ver. Break
Screwball 0.1
Dropball -0.6
Riseball -1.3
Other -2.3
Curveball -2.6
Changeup 3.7
Fastball -1.4

True Spin Rate

PitchAvg
True Spin Rate
Screwball 352
Dropball 395
Riseball 552
Other 746
Curveball 481
Changeup 919
Fastball 631

Player

Name: Stella Koo
Birthdate: 8/26/2012
Uniform Number: 99
Throws From: R
Bats From: R
Primary Position: P
Secondary Positions: OF

Parent-1

Name: Ben Koo
Email: benkoosd@gmail.com

Social Networking



High School

Graduation Year: 2031
GPA: 4.0

Highlights & Achievements

December 2025 : OVMS Character Counts Award - Citizenship

Extracurricular

Member of San Diego Bethel Youth Ensemble : April 2026 - Present
Member of Total Youth Productions : August 2026 - Present

Travel Team Experience

August 2023 - July 2026 : Power Surge Walling/Sterling 2030
August 2026 - Present : Power Surge DLR

Private Coaches

Pitching - Coach Monica Fenton : (760) 443-8571
Hitting - Coach Chloe Camarero : (619) 916-7623

Stats, Highlights & Videos

Softball Highlights: February 2025 : Alliance Fastpitch - PCFL Player of the Month

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Version: P-1.0